Abstract: Establishing the penetration resistance model of rigid projectile is the primary problem to be solved when the penetration of reinforced concrete target is theoretically modeled. Based on the cavity expansion theory of reinforced concrete^\[3\] and the crater depth model^\[4\], a dynamic response model of reinforcing steel bar under impact load of projectile is proposed by analyzing the movement relationship between projectile and reinforcing steel bar, as well as the force and failure of reinforcing steel bar. On the basis of impact force acting on projectile by a single reinforcing steel bar, a relatively complete resistance model of rigid projectile normally penetrating into reinforced concrete target is established by considering the situations that the projectiles impact different typical positions and simultaneously interact with two reinforced layers. Combining with the experimental data in Ref. \[13-14,18-20\], the proposed theoretical model is verified, and the influences of relevant parameters are analyzed. The results show that the proposed model can reasonably calculate the penetration process and reflect the details of the interaction between projectile and steel bar. Key

Key words: ordnancescienceandtechnology, penetration, reinforcedconcrete, cavityexpansiontheory, rigidprojectile, resistance